Rotary casting



Aug. 24, 1943. E. SCHQTZ ROTARY CASTING Filed Sept. 27, 1941 INVENTOR BYWW1; "9v: ATTORNEY.

Patented Aug. 24, 1943 umrensmres rarest QFFICE ,f. r gaming ROTAR AS NGI Aktiengesellschaft Oederlin & 00.,

Switzerland Baden,

Application September 2'1, 1941, Serial No. 412,585 In SwitzerlandAugust 20, 1940 2 Claims.

The present invention relates to the art of rotary or centrifugalcasting.

The object of the invention is the provision of a method and a devicefor the coreless casting of several rings in one casting piece which arecoaxially arranged so that their circular center lines are located on arotary surface, for instance in a plane, on a rotary cone or on asphere.

The rotatable mould provided for this centrif- V device, wherein thecoaxial rings are arranged in one and the same plane.

Figs. 2- to 4 show diiferent embodiments on axial sections wherein therings are conically arranged, having their circular center lines locatedon the surface of a rotary cone.

According to Fig. l a disk 2 is fastened to a horizontally journalledshaft 1 which can be put into rapid rotation. Said disk 2 carries at itscircumference screws 3 provided with wing nuts and hinged to pins 4 bywhich a second disk 5 is detachably bolted to the disk 2. Thev sides ofthe two disks 2 and 5 facing each other show each a recess 6 and 1,respectively, containing the mould plates 8 and 9, respectively, whichare again provided with corresponding cavities 1 ll according to thering piece to be cast the total cross section of which may have arectangular, trapezoid or any convenient form. With a view of savingmetal the casting at the places of transition from one ring to the nextone may be reduced in thickness by constictions I I which must present,however, only a gradual change in the Width of the cavity for assuringan easy passage and constant contact of the molten metal with the wallsof the mould.

The embodiment shown in Fig. 1 presents a rotaryjplane b-b, wherein theconcentric rings are disposed. The casting piece has therefore the formof a plate with a central hole. The centrifugal casting takes place whenthe described device is in. rapid rotation by pouring the molten metalthrough the pouring gate I2 of the disk 5 into the cavity Ill in such aquantity till the cavity 10 is filled over the edge Hi.

In Fig. 2 the cross section of the cavity l0 presents as middle line agenerating line a--b of a rotary cone a,bb about the axis (1-0 and themiddle line db may vary from 10 to 70 and more. The conical arrangementof the mould cavity includes the advantage that the flow of molten metalbefore reaching the cavity [0, is deviated from the radial plane l4including the direction of the centrifugal force upon a conical surfacedb and enters the cavity in a condensed mass along the outer wallthereof, so that the splashing of the same into small particles isessentially avoided. The centrifugal force upon the flow of the moltenmetal effects an and dense structure.

exact filling of the cavity and produces a regular The cone upon whichthe rings are located may have its apex on the side opposite that shownin the drawing.

The embodiment shown in Fig. 3 presents a construction which isspecially adapted to be rotated about a horizontal axis g. The chargingof the molten metal takes place through the pouring gate l2. The moltenmetal runs along the conical surface l5 wherefrom it is deviated intothe mould cavity Ill. The coaxial rings are located on a conical surfacede having an acute apex angle, so that the diameters of the three ringsdo not much differ from one another.

.The embodiment according to Fig. 4 is suitable for rotation about ahorizontal as well as a vertical axis f-g. The mould cavity In isarranged on the conical surface de. The molten metal is charged throughthe pouringvgate' l2 and follows the conical surface l6 into the cavity[0 of the concentric rings and is freely admitted thereto on the wholelength of the circumference of said cavity having the smallest diameter.

For high peripheral speed the device can be arranged below the ground.

It will be understood that the rings after being cast are to beseparated by any mechanical process and be worked out into sectionalbars by mashining.

What I claim is:

1. A rotatable mould for casting several coreless rings by centrifugalaction comprising an annular cavity therein consisting of a number ofcontinuously communicated coaxial chambers for generating acorresponding number of rings in one casting piece, said cavitypresenting constrictions at the places of transition from one chamber tothe next one, the circular center lines of said chambers being locatedon the sur v face of a rotary cone coaxial with the axis of rotation ofthe mould, and a pouring gate for the molten metal communicating on thewhole circular length with the chamber, the center line of which has thesmallest diameter.

2. A rotatable mould for casting several coreless rings by centrifugalaction comprising an annular cavity therein consisting of a number ofcontinuously communicated coaxial chambers for generating acorresponding number of rings in one casting piece, the circular centerlines oi said chambers having different diameters from one another,while the cross sectional area of each chamber is inversely proportionalto'the v chamber, the center line of which has the smalldiameter of itscircular center line, said cavity presenting constrictions at the placesof transition from one chamber to the next one, which are dimensioned toallow an easy passage of the molten metal and the escape of the air, apouring gate for the molten metal coaxially arranged with respect tosaid cavity, and an intermediate passage between said pouring gate andsaid cavity for deviating the molten metal from the direction of thecentrifugal force and communieating on the whole circular length withthe est diameter.

EDWIN scHii'rz.

